Which option is NOT described as a type of disease surveillance in the material?

• A. Passive surveillance
• B. Active surveillance
• C. Sentinel surveillance
• D. Randomized surveillance

Answer: (D)

Understanding disease surveillance focuses on how data are collected for ongoing monitoring. Passive surveillance relies on routine reports from providers and laboratories. Active surveillance uses dedicated efforts to actively seek out cases. Sentinel surveillance collects data from a selected network of reporting sites to monitor trends. Randomized surveillance isn’t a standard category in surveillance practice; randomization is a study design tool used in research or sampling, not a routine method for collecting surveillance data. So the option that doesn’t fit as a surveillance type is the randomized approach.